Aluminum alloy cladding material and production method for aluminum alloy cladding material

Abstract

An aluminum alloy clad material includes: a core material; and a sacrificial anode material layer clad on one surface or both surfaces of the core material. Each of the core material and the sacrificial anode material layer has a predetermined composition. In the core material, the number density of an Al—Mn-based intermetallic compound having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5 particles/mm 2 or more, and the number density of Al 2 Cu having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5 particles/mm 2 or less. In the sacrificial anode material layer, the number density of a Mg—Si-based crystallized product having an equivalent circle diameter of 0.1 to 5.0 μm is 100 to 150,000 particles/mm 2 , and the number density of a Mg—Si-based crystallized product having an equivalent circle diameter of more than 5.0 μm and 10.0 μm or less is 5 particles/mm 2 or less.

1 . An aluminum alloy clad material comprising: a core material comprising an aluminum alloy; and a sacrificial anode material layer clad on one surface or both surfaces of the core material, wherein
 the core material comprises an aluminum alloy comprising more than 0 mass % and less than 0.2 mass % Si, 0.05 to 0.30 mass % Fe, 1.0 to 2.5 mass % Cu, 1.0 to 1.6 mass % Mn, 0.1 to 1.0 mass % Mg, with a balance of Al and inevitable impurities;   the sacrificial anode material layer comprises an aluminum alloy comprising 0.1 to 1.5 mass % Si, 0.1 to 2.0 mass % Mg, with a balance of Al and inevitable impurities;   in the core material, a number density of an Al—Mn-based intermetallic compound having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5  particles/mm 2  or more, and a number density of Al 2 Cu having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5  particles/mm 2  or less; and   in the sacrificial anode material layer, a number density of a Mg—Si-based crystallized product having an equivalent circle diameter of 0.1 to 5.0 μm is 100 to 150,000 particles/mm 2 , and a number density of a Mg—Si-based crystallized product having an equivalent circle diameter of more than 5.0 μm and 10.0 μm or less is 5 particles/mm 2  or less.   
     
     
         2 . The aluminum alloy clad material according to  claim 1 , wherein
 the core material comprises an aluminum alloy further comprising one or more selected from a group consisting of 0.05 to 0.20 mass % Ti, 0.05 to 0.20 mass % Zr, 0.05 to 0.20 mass % Cr, and 0.05 to 0.20 mass % V.   
     
     
         3 . The aluminum alloy clad material according to  claim 1 , wherein
 the sacrificial anode material layer comprises an aluminum alloy further comprising one or more selected from a group consisting of 0.05 to 1.00 mass % Fe, 0.05 to 1.00 mass % Ni, 0.05 to 1.00 mass % Cu, 0.05 to 1.50 mass % Mn, 0.05 to 1.00 mass % Zn, 0.05 to 0.20 mass % Ti, 0.05 to 0.30 mass % Zr, 0.05 to 0.30 mass % Cr, and 0.05 to 0.30 mass % V.   
     
     
         4 . A method for producing the aluminum alloy clad material according to  claim 1 , the method comprising:
 a casting step of casting each of the aluminum alloy for the core material and the aluminum alloy for the sacrificial anode material layer; a homogenization treatment step of performing homogenization treatment of a cast ingot of the sacrificial anode material layer; a hot-rolling step of hot-rolling the ingot of the sacrificial anode material layer, subjected to the homogenization treatment, to have a predetermined thickness; a joining step of combining one surface or both surfaces of a core material ingot with the sacrificial anode material layer allowed to have the predetermined thickness by the hot rolling to form a joined material; a joining heating step of heating the joined material; a hot clad rolling step of hot-rolling the heated joined material; and a cold-rolling step of cold-rolling the hot-clad-rolled clad material,   wherein a rate of cooling an ingot surface by semi-continuous casting is set to 1° C./s or more in the step of casting the aluminum alloy for the sacrificial anode material layer; in the step of performing the homogenization treatment of the ingot of the sacrificial anode material layer, heat treatment of the ingot is performed at a temperature of 450 to 570° C. for 1 hour or more; a heating temperature in the joining heating step is 420 to 550° C.; and a retention time at 320 to 400° C. is 6 minutes or less after the joining heating step.   
     
     
         5 . The method for producing an aluminum alloy clad material according to  claim 4 , the method further comprising a homogenization treatment step of performing homogenization treatment of an ingot of the core material after the step of casting the core material, wherein heat treatment of the ingot of the core material is performed at a temperature of 400 to 550° C. in the homogenization treatment step. 
     
     
         6 . The method for producing an aluminum alloy clad material according to  claim 4 , the method further comprising one or more annealing steps of annealing the clad material during or after the cold-rolling step, or during and after the cold-rolling step, wherein heat treatment of the clad material is performed at a temperature of 200 to 320° C. in the annealing steps. 
     
     
         7 . An aluminum alloy clad material comprising: a core material comprising an aluminum alloy; a sacrificial anode material layer clad on one surface of the core material; and a brazing filler material clad on another surface of the core material, wherein
 the core material comprises an aluminum alloy comprising more than 0 mass % and less than 0.2 mass % Si, 0.05 to 0.30 mass % Fe, 1.0 to 2.5 mass % Cu, 1.0 to 1.6 mass % Mn, 0.1 to 1.0 mass % Mg, and a balance of Al and inevitable impurities;   the sacrificial anode material layer comprises an aluminum alloy comprising 0.1 to 1.5 mass % Si, 0.1 to 2.0 mass % Mg, and a balance of Al and inevitable impurities;   the brazing filler material comprises an Al—Si-based alloy comprising 7.0 to 12.0 mass % Si and a balance of Al and inevitable impurities;   in the core material, a number density of an Al—Mn-based intermetallic compound having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5  particles/mm 2  or more, and a number density of Al 2 Cu having an equivalent circle diameter of 0.1 μm or more is 1.0×10 5  particles/mm 2  or less; and   in the sacrificial anode material layer, a number density of a Mg—Si-based crystallized product having an equivalent circle diameter of 0.1 to 5.0 μm is 100 to 150,000 particles/mm 2 , and a number density of a Mg—Si-based crystallized product having an equivalent circle diameter of more than 5.0 μm and 10.0 μm or less is 5 particles/mm 2  or less.   
     
     
         8 . The aluminum alloy clad material according to  claim 7 , wherein
 the core material comprises an aluminum alloy further comprising one or more selected from a group consisting of 0.05 to 0.20 mass % Ti, 0.05 to 0.20 mass % Zr, 0.05 to 0.20 mass % Cr, and 0.05 to 0.20 mass % V.   
     
     
         9 . The aluminum alloy clad material according to  claim 7 , wherein
 the sacrificial anode material layer comprises an aluminum alloy further comprising one or more selected from a group consisting of 0.05 to 1.00 mass % Fe, 0.05 to 1.00 mass % Ni, 0.05 to 1.00 mass % Cu, 0.05 to 1.50 mass % Mn, 0.05 to 1.00 mass % Zn, 0.05 to 0.20 mass % Ti, 0.05 to 0.30 mass % Zr, 0.05 to 0.30 mass % Cr, and 0.05 to 0.30 mass % V.   
     
     
         10 . The aluminum alloy clad material according to  claim 7 , wherein
 the brazing filler material comprises an Al—Si—Cu-based alloy further comprising 0.5 to 2.5 mass % Cu.   
     
     
         11 . The aluminum alloy clad material according to  claim 10 , wherein
 the brazing filler material comprises an Al—Si—Cu—Zn-based alloy further comprising 0.1 to 3.0 mass % Zn.   
     
     
         12 . A method for producing the aluminum alloy clad material according to  claim 7 , the method comprising:
 a casting step of casting each of the aluminum alloy for the core material, the aluminum alloy for the sacrificial anode material layer, and the aluminum alloy for the brazing filler material; a homogenization treatment step of performing homogenization treatment of a cast ingot of the sacrificial anode material layer; a hot-rolling step of hot-rolling each of the ingot of the sacrificial anode material layer, subjected to the homogenization treatment, and an ingot of the brazing filler material to have a predetermined thickness; a joining step of combining each of one surface of a core material ingot with the sacrificial anode material layer allowed to have the predetermined thickness by the hot rolling and another surface of the core material ingot with the brazing filler material allowed to have the predetermined thickness by the hot rolling to form a joined material; a joining heating step of heating the joined material; a hot clad rolling step of hot-rolling the heated joined material; and a cold-rolling step of cold-rolling the hot-clad-rolled clad material,   wherein a rate of cooling an ingot surface by semi-continuous casting is set to 1° C./s or more in the step of casting the aluminum alloy for the sacrificial anode material layer; in the step of performing the homogenization treatment of the ingot of the sacrificial anode material layer, heat treatment of the ingot is performed at a temperature of 450 to 570° C. for 1 hour or more; a heating temperature in the joining heating step is 420 to 550° C.; and a retention time at 320 to 400° C. is 6 minutes or less after the joining heating step.   
     
     
         13 . The method for producing an aluminum alloy clad material according to  claim 12 , the method further comprising a homogenization treatment step of performing homogenization treatment of an ingot of the core material after the step of casting the core material, wherein heat treatment of the ingot of the core material is performed at a temperature of 400 to 550° C. in the homogenization treatment step. 
     
     
         14 . The method for producing an aluminum alloy clad material according to  claim 12 , the method further comprising one or more annealing steps of annealing the clad material during or after the cold-rolling step, or during and after the cold-rolling step, wherein heat treatment of the clad material is performed at a temperature of 200 to 320° C. in the annealing steps.